If a scientist holds an idea to be true and finds any counter evidence whatever, the idea is either or abandoned.

A．is a by-product of the oil-producing countries
B．is where to find new energy resources
C．can not be solved without coordinated efforts
D．is that no resources are inexhaustible

A．we must revive morality and the spirit of devotion
B．we should decrease the use of cars
C．we must fight against lawbreaking behavior
D．we should defend our ideals wholeheartedly